Implement rack



FIG. 1 is a perspective view of an implement rack showing our new design;

FIG. 2 is a side elevational view taken from the right of FIG. 1, the side opposite being a mirror image thereof;

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for an implement rack, substantially as shown. 